python图片处理库pillow-凯发app官方网站

from pil import image, imagedraw, imagefont

from random import choice, randint, randrange

import string

# 候选字符集,大小写字母数字

chrs = string.ascii_letters string.digits

def rand_chars(length):

  """

  返回length个随机字符串

  """

  result = ''.join(choice(chrs) for _ in range(length))

  return result

def rand_color():

  """

  设置随机颜色

  """

  r = randint(0, 255)

  g = randint(0, 255)

  b = randint(0, 255)

  return (r, g, b)

def draw_rand_line(num, size, draw):

    """

    绘制随机干扰线

    """

    # 绘制随机干扰线，这里设置为8条

    for i in range(num):

        start = (0, randrange(size[1]))

        end = (size[0], randrange(size[1]))

        draw.line([start, end], fill=rand_color(), width=1)

    # 绘制随机弧线

    for i in range(8):

        start = (-50, -50) # 起始位置在外边看起来才会像弧线

        end = (size[0] 10, randint(0, size[1] 10))

        draw.arc(start end, 0, 360, fill=rand_color())

def draw_rand_point(size, draw):

    """

    绘制随机干扰点

    """

    for i in range(int(size[0]*size[1]*0.07)): # 7%密度的干扰像素

        draw.point((randrange(size[0]), randrange(size[1])), fill=rand_color()) # randrange取值范围是左开右闭

def verify_code(size, chrnumber, bgcolor=(255, 255, 255)):

    """

    定义图片大小，验证码长度，背景颜色

    """

    # 创建空白图像

    image = image.new('rgb', size, bgcolor)

    # 创建绘图对象

    draw = imagedraw.draw(image)

    # 创建font对象

    font = imagefont.truetype('c:\\windows\\fonts\\arial.ttf', 48) # 选定一款系统字体

    # 生成并计算随机字符的宽度和高度

    text = rand_chars(chrnumber)

    width, height = draw.textsize(text, font)

    # 绘制字符串

    x_start = 5

    char_w = width // chrnumber - 2 # 计算每个字符宽度

    for i in range(chrnumber):

        position = (x_start, (size[1]-height)//2 randint(-10, 10)) # 字符坐标, y坐标上下浮动

        draw.text(xy=position, text=text[i], font=font, fill=rand_color()) # 绘制函数

        x_start = char_w 1

    image.show()

    # 绘制随机颜色随机位置的干扰像素

    draw_rand_point(size, draw)

    image.show()

    # 绘制干扰线

    draw_rand_line(8, size, draw)

    image.show()

    # 保存图片

    image.save('veri_code.jpg')

if __name__ == "__main__":

    # load_image()

    verify_code((200, 100), 6, (255, 255, 255))